Electronic signal detector



FIG. 1 is a perspective view of an electronic signal detector embodying the design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a side elevational view thereof, the opposite side being a mirror image of the side shown.

FIG. 4 is a front elevational view thereof.

FIG. 5 is a rear elevational view thereof. 

The ornamental design for an electronic signal detector, as shown and described. 